Use of the builtin name 'filter' as variable name

[Ed Leafe]

The nova/filters.py script uses the name 'filter' for variables, which conflicts with the builtin function 'filter'.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/186567

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/186567
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=7fb641c8316b0026fd1649cddb4b3aa48ef3dc3e
Submitter: Jenkins
Branch: master

commit 7fb641c8316b0026fd1649cddb4b3aa48ef3dc3e
Author: EdLeafe <email address hidden>
Date: Thu May 28 16:23:49 2015 -0500

    Remove use of builtin name

    Change the use of the name 'filter' to 'filter_' so that it doesn't
    conflict with the builtin function 'filter'.

    Change-Id: Iaa18aa54fbd8578c3b0d3313540393541c002720
    Closes-Bug: #1459826